# include <stdio.h>
int main() {
    int n,step = 0;
    scanf("%d",&n);
    while (n != 1) {
        if(n % 2 == 0) n = n/2 ;
        else n = (3*n + 1) / 2;
        step++;
        }
    printf("%d\n",step);
    return 0;

}
